Steel sheet for hot pressing use, press-formed product, and method for manufacturing press-formed product
US-2018312947-A1 · Nov 1, 2018 · US
Steel sheet for hot stamping
US11027522B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11027522-B2 |
| Application number | US-201716467295-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 17, 2017 |
| Priority date | Jan 17, 2017 |
| Publication date | Jun 8, 2021 |
| Grant date | Jun 8, 2021 |
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- Title
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Abstract
Official abstract text for this publication.
A steel sheet for hot stamping includes a steel structure represented by an area fraction of bainite, fresh martensite and tempered martensite: 80% or more in total, and a product of a number density (pieces/μm 2 ) of carbides and a proportion of carbides precipitated into prior austenite grains in carbides: 0.50 or more.
First claim
Opening claim text (preview).
The invention claimed is: 1. A steel sheet for hot stamping comprising a steel structure comprising an area fraction of bainite, fresh martensite and tempered martensite: 80% or more in total, and a product of a number density of carbides, in pieces/μm 2 , and a proportion of carbides precipitated into prior austenite grains in carbides: 0.50 or more and 10 or less. 2. The steel sheet for hot stamping according to claim 1 , wherein a C content is not less than 0.27 mass % nor more than 0.60 mass %. 3. The steel sheet for hot stamping according to claim 1 , wherein a Vickers hardness is 500 Hv or more. 4. The steel sheet for hot stamping according to claim 2 , wherein a Vickers hardness is 500 Hv or more. 5. The steel sheet for hot stamping according to claim 1 , comprising a plating layer. 6. The steel sheet for hot stamping according to claim 2 , comprising a plating layer. 7. The steel sheet for hot stamping according to claim 3 , comprising a plating layer. 8. The steel sheet for hot stamping according to claim 4 , comprising a plating layer.
Assignees
Inventors
Classifications
during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title
to produce plates or strips for drawing, e.g. for deep-drawing · CPC title
Martensite · CPC title
Dispersions; Precipitations · CPC title
Bainite · CPC title
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Frequently asked questions
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- What does patent US11027522B2 cover?
- A steel sheet for hot stamping includes a steel structure represented by an area fraction of bainite, fresh martensite and tempered martensite: 80% or more in total, and a product of a number density (pieces/μm 2 ) of carbides and a proportion of carbides precipitated into prior austenite grains in carbides: 0.50 or more.
- Who is the assignee on this patent?
- Nippon Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C22C38/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jun 08 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).